Method for treating high-ammonia-nitrogen wastewater by feeding polyurethane filler

Abstract

The invention relates to a method for treating high-ammonia-nitrogen wastewater by feeding a polyurethane filler. According to the method, high-ammonia-nitrogen wastewater is subjected to blowing denitrogenation pretreatment to reduce the concentration of ammonia nitrogen and to recover ammonia nitrogen; then treated ammonia-nitrogen wastewater enters an aerobic tank fed with the filler for nitration and then enters an anoxic tank fed with the filler for denitrification; so finally the wastewater reaches the standard and is then discharged. Through blowing denitrogenation pretreatment, impactof high content of ammonia nitrogen on a biochemical system can be effectively reduced, the resource of ammonia nitrogen can be recovered, and harmless and recycling treatment of the wastewater is realized; the aerobic tank and the anoxic tank are both fed with the polyurethane filler, so the concentration and stability of sludge can be improved, and the load capacity and impact resistance of thesludge can be enhanced; and after feeding of the polyurethane filler, the sludge adheres onto the polyurethane filler, so a good growth environment is formed for breeding of protists and metazoans, afood chain is extended and enriched, and the output of residual sludge is effectively reduced.

Description

technical field [0001] The invention relates to a wastewater treatment technology in the chemical industry, in particular to a method for treating wastewater with high ammonia nitrogen content by adding polyurethane fillers. Background technique [0002] Coal chemical enterprises produce a large amount of wastewater in the process of coking and gasification. These wastewaters have the characteristics of large water volume and high pollutant concentration. Among them, the ammonia nitrogen content of high ammonia nitrogen wastewater is as high as 3000-9000mg / L, which has caused huge damage to the normal operation of the enterprise and the surrounding environment. pressure. my country's coal chemical enterprises are mostly distributed in Northwest and North China. Water resources are scarce, expensive, and lack receiving water bodies. The Ministry of Environmental Protection requires coal chemical enterprises to meet the "zero discharge" standard. The problem of high ammonia n...

AI Technical Summary

Problems solved by technology

The problem of high ammonia nitrogen wastewater treatment has seriously affected the development of coal chemical enterprises. Conventional biochemical methods are used to treat high ammonia nitrogen wastewater, often requiring multi-stage processes in series and difficult to achieve discharge standards after treatment. There are problems such as complex processes and high treatment costs.

[0003] A coal chemical company in Ningxia produces 1t / h of high-ammonia-nitrogen wastewater, with an ammonia-nitrogen concentration of 3000mg / L. The discharge of ammonia-nitrogen wastewater into the water will cause serious environmental pollution, causing water eutrophication, black and odorous water, and other problems, and has a toxic effect on people and organisms.

Faced with the country's restrictions on the discharge of coal gasification wastewater and the requirement of 100% reuse, it is difficult to achieve satisfactory results in the treatment of the wastewater by traditional biochemical treatment processes, which limits the further development of coal chemical enterprises

[0004] The conventional treatment method for high ammonia nitrogen wastewater is to blow off nitrogen and then proceed to biochemical treatment. However, because the biochemical system has high requirements for ammonia nitrogen in the influent, the concentration of ammonia nitrogen after blowing off nitrogen often cannot meet the water requirements of the biochemical system. At this time, the ammonia nitrogen wastewater enters the biochemical system. After the system, it will impact the biochemical sludge and affect the normal operation of the biochemical system

[0005] The patent "Ammonia Nitrogen Recovery Equipment, Multi-stage Ammonia Nitrogen Wastewater Treatment System" (application number: 201510171724.7) discloses a kind of ammonia nitrogen recovery equipment, which adjusts the pH of ammonia nitrogen wastewater to an appropriate value through the pH value control unit, and then goes to the thin film distillation unit and electrodialysis unit After treatment, the removal and recovery of ammonia nitrogen has been realized, but there are problems such as complicated process and long treatment time

[0006] "Experimental Research on the Treatment of High Ammonia Nitrogen Wastewater by Electrochemical Oxidation" (Lu Jian, Safety and Environmental Engineering, 2010, 17(2):51-53) In view of the secondary pollution and high ammonia nitrogen value of the effluent in the traditional high ammonia nitrogen wastewater treatment process, etc. The problem is that the electrochemical oxidation method is used to test and study the high ammonia nitrogen water distribution. The results show that the concentration of ammonia nitrogen can be reduced from 2000mg / L to 247.51mg / L after electrolysis for 90 minutes. application prospects, but there are problems such as complex process and high cost